Quick answer: 15 minutes equals 0.25 hours, 30 minutes equals 0.50 hours and 45 minutes equals 0.75 hours. Divide the number of minutes by 60 to get the decimal part of an hour.
Calculate another duration: Open the Time Calculator and choose Decimal hours.
Quick quarter-hour reference
| Minutes | Decimal hours | Fraction of an hour |
|---|---|---|
| 0 | 0.00 | 0 |
| 15 | 0.25 | ¼ |
| 30 | 0.50 | ½ |
| 45 | 0.75 | ¾ |
| 60 | 1.00 | 1 |
What about durations that are not exactly 15-minute increments?
Use the same calculation for any number of minutes. For example, 10 minutes = 10 ÷ 60 = 0.1666… hours; 20 minutes = 0.3333…; and 35 minutes = 0.5833…. You can show two decimal places for a quick estimate, but keep additional precision when aggregating records to reduce rounding error.
Worked time examples
- 2 hours 15 minutes = 2 + 15/60 = 2.25 hours.
- 6 hours 30 minutes = 6 + 30/60 = 6.50 hours.
- 7 hours 45 minutes = 7 + 45/60 = 7.75 hours.
- 1 hour 5 minutes = 1 + 5/60 = 1.0833… hours.
Decimal hours are not clock notation
Be careful with a value such as 8.30. In decimal hours, 0.30 × 60 = 18 minutes, so 8.30 decimal hours equals 8 hours 18 minutes. Eight hours and 30 minutes is 8.50 decimal hours, not 8.30.
A useful check before recording time
If you are combining several durations, add the underlying minutes first and convert only the final total. This avoids discrepancies caused by repeatedly rounding numbers such as 0.1666… . For payroll or contractual purposes, use the agreed time-recording method; BuzBolt explains the mathematics, not workplace policy.
Explore the full method
See the complete minutes-to-decimal-hours chart, or learn the reverse calculation in decimal hours back to hours and minutes.
BuzBolt provides general educational tools and explanations. Check your inputs and confirm any legal, tax, accounting or workplace-specific requirements independently where relevant.